![Alan Stern](/assets/img/avatar_default.png)
This patch (as1375) eliminates the usb_host_ss_ep_comp structure used for storing a dynamically-allocated copy of the SuperSpeed endpoint companion descriptor. The SuperSpeed descriptor is placed directly in the usb_host_endpoint structure, alongside the standard endpoint descriptor. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
757 lines
22 KiB
C
757 lines
22 KiB
C
#include <linux/usb.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/hcd.h>
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#include <linux/usb/quirks.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <asm/byteorder.h>
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#include "usb.h"
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#define USB_MAXALTSETTING 128 /* Hard limit */
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#define USB_MAXENDPOINTS 30 /* Hard limit */
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#define USB_MAXCONFIG 8 /* Arbitrary limit */
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static inline const char *plural(int n)
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{
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return (n == 1 ? "" : "s");
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}
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static int find_next_descriptor(unsigned char *buffer, int size,
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int dt1, int dt2, int *num_skipped)
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{
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struct usb_descriptor_header *h;
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int n = 0;
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unsigned char *buffer0 = buffer;
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/* Find the next descriptor of type dt1 or dt2 */
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while (size > 0) {
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h = (struct usb_descriptor_header *) buffer;
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if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2)
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break;
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buffer += h->bLength;
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size -= h->bLength;
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++n;
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}
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/* Store the number of descriptors skipped and return the
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* number of bytes skipped */
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if (num_skipped)
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*num_skipped = n;
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return buffer - buffer0;
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}
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static void usb_parse_ss_endpoint_companion(struct device *ddev, int cfgno,
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int inum, int asnum, struct usb_host_endpoint *ep,
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unsigned char *buffer, int size)
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{
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struct usb_ss_ep_comp_descriptor *desc;
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int max_tx;
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/* The SuperSpeed endpoint companion descriptor is supposed to
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* be the first thing immediately following the endpoint descriptor.
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*/
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desc = (struct usb_ss_ep_comp_descriptor *) buffer;
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if (desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP ||
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size < USB_DT_SS_EP_COMP_SIZE) {
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dev_warn(ddev, "No SuperSpeed endpoint companion for config %d "
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" interface %d altsetting %d ep %d: "
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"using minimum values\n",
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cfgno, inum, asnum, ep->desc.bEndpointAddress);
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/* Fill in some default values.
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* Leave bmAttributes as zero, which will mean no streams for
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* bulk, and isoc won't support multiple bursts of packets.
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* With bursts of only one packet, and a Mult of 1, the max
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* amount of data moved per endpoint service interval is one
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* packet.
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*/
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ep->ss_ep_comp.bLength = USB_DT_SS_EP_COMP_SIZE;
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ep->ss_ep_comp.bDescriptorType = USB_DT_SS_ENDPOINT_COMP;
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if (usb_endpoint_xfer_isoc(&ep->desc) ||
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usb_endpoint_xfer_int(&ep->desc))
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ep->ss_ep_comp.wBytesPerInterval =
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ep->desc.wMaxPacketSize;
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return;
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}
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memcpy(&ep->ss_ep_comp, desc, USB_DT_SS_EP_COMP_SIZE);
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/* Check the various values */
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if (usb_endpoint_xfer_control(&ep->desc) && desc->bMaxBurst != 0) {
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dev_warn(ddev, "Control endpoint with bMaxBurst = %d in "
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"config %d interface %d altsetting %d ep %d: "
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"setting to zero\n", desc->bMaxBurst,
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cfgno, inum, asnum, ep->desc.bEndpointAddress);
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ep->ss_ep_comp.bMaxBurst = 0;
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} else if (desc->bMaxBurst > 15) {
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dev_warn(ddev, "Endpoint with bMaxBurst = %d in "
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"config %d interface %d altsetting %d ep %d: "
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"setting to 15\n", desc->bMaxBurst,
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cfgno, inum, asnum, ep->desc.bEndpointAddress);
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ep->ss_ep_comp.bMaxBurst = 15;
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}
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if ((usb_endpoint_xfer_control(&ep->desc) ||
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usb_endpoint_xfer_int(&ep->desc)) &&
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desc->bmAttributes != 0) {
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dev_warn(ddev, "%s endpoint with bmAttributes = %d in "
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"config %d interface %d altsetting %d ep %d: "
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"setting to zero\n",
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usb_endpoint_xfer_control(&ep->desc) ? "Control" : "Bulk",
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desc->bmAttributes,
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cfgno, inum, asnum, ep->desc.bEndpointAddress);
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ep->ss_ep_comp.bmAttributes = 0;
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} else if (usb_endpoint_xfer_bulk(&ep->desc) &&
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desc->bmAttributes > 16) {
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dev_warn(ddev, "Bulk endpoint with more than 65536 streams in "
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"config %d interface %d altsetting %d ep %d: "
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"setting to max\n",
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cfgno, inum, asnum, ep->desc.bEndpointAddress);
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ep->ss_ep_comp.bmAttributes = 16;
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} else if (usb_endpoint_xfer_isoc(&ep->desc) &&
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desc->bmAttributes > 2) {
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dev_warn(ddev, "Isoc endpoint has Mult of %d in "
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"config %d interface %d altsetting %d ep %d: "
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"setting to 3\n", desc->bmAttributes + 1,
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cfgno, inum, asnum, ep->desc.bEndpointAddress);
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ep->ss_ep_comp.bmAttributes = 2;
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}
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if (usb_endpoint_xfer_isoc(&ep->desc))
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max_tx = ep->desc.wMaxPacketSize * (desc->bMaxBurst + 1) *
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(desc->bmAttributes + 1);
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else if (usb_endpoint_xfer_int(&ep->desc))
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max_tx = ep->desc.wMaxPacketSize * (desc->bMaxBurst + 1);
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else
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max_tx = 999999;
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if (desc->wBytesPerInterval > max_tx) {
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dev_warn(ddev, "%s endpoint with wBytesPerInterval of %d in "
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"config %d interface %d altsetting %d ep %d: "
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"setting to %d\n",
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usb_endpoint_xfer_isoc(&ep->desc) ? "Isoc" : "Int",
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desc->wBytesPerInterval,
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cfgno, inum, asnum, ep->desc.bEndpointAddress,
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max_tx);
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ep->ss_ep_comp.wBytesPerInterval = max_tx;
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}
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}
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static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
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int asnum, struct usb_host_interface *ifp, int num_ep,
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unsigned char *buffer, int size)
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{
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unsigned char *buffer0 = buffer;
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struct usb_endpoint_descriptor *d;
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struct usb_host_endpoint *endpoint;
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int n, i, j, retval;
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d = (struct usb_endpoint_descriptor *) buffer;
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buffer += d->bLength;
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size -= d->bLength;
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if (d->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE)
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n = USB_DT_ENDPOINT_AUDIO_SIZE;
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else if (d->bLength >= USB_DT_ENDPOINT_SIZE)
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n = USB_DT_ENDPOINT_SIZE;
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else {
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dev_warn(ddev, "config %d interface %d altsetting %d has an "
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"invalid endpoint descriptor of length %d, skipping\n",
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cfgno, inum, asnum, d->bLength);
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goto skip_to_next_endpoint_or_interface_descriptor;
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}
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i = d->bEndpointAddress & ~USB_ENDPOINT_DIR_MASK;
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if (i >= 16 || i == 0) {
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dev_warn(ddev, "config %d interface %d altsetting %d has an "
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"invalid endpoint with address 0x%X, skipping\n",
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cfgno, inum, asnum, d->bEndpointAddress);
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goto skip_to_next_endpoint_or_interface_descriptor;
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}
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/* Only store as many endpoints as we have room for */
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if (ifp->desc.bNumEndpoints >= num_ep)
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goto skip_to_next_endpoint_or_interface_descriptor;
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endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints];
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++ifp->desc.bNumEndpoints;
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memcpy(&endpoint->desc, d, n);
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INIT_LIST_HEAD(&endpoint->urb_list);
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/* Fix up bInterval values outside the legal range. Use 32 ms if no
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* proper value can be guessed. */
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i = 0; /* i = min, j = max, n = default */
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j = 255;
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if (usb_endpoint_xfer_int(d)) {
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i = 1;
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switch (to_usb_device(ddev)->speed) {
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case USB_SPEED_SUPER:
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case USB_SPEED_HIGH:
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/* Many device manufacturers are using full-speed
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* bInterval values in high-speed interrupt endpoint
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* descriptors. Try to fix those and fall back to a
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* 32 ms default value otherwise. */
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n = fls(d->bInterval*8);
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if (n == 0)
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n = 9; /* 32 ms = 2^(9-1) uframes */
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j = 16;
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break;
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default: /* USB_SPEED_FULL or _LOW */
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/* For low-speed, 10 ms is the official minimum.
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* But some "overclocked" devices might want faster
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* polling so we'll allow it. */
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n = 32;
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break;
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}
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} else if (usb_endpoint_xfer_isoc(d)) {
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i = 1;
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j = 16;
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switch (to_usb_device(ddev)->speed) {
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case USB_SPEED_HIGH:
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n = 9; /* 32 ms = 2^(9-1) uframes */
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break;
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default: /* USB_SPEED_FULL */
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n = 6; /* 32 ms = 2^(6-1) frames */
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break;
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}
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}
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if (d->bInterval < i || d->bInterval > j) {
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dev_warn(ddev, "config %d interface %d altsetting %d "
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"endpoint 0x%X has an invalid bInterval %d, "
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"changing to %d\n",
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cfgno, inum, asnum,
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d->bEndpointAddress, d->bInterval, n);
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endpoint->desc.bInterval = n;
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}
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/* Some buggy low-speed devices have Bulk endpoints, which is
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* explicitly forbidden by the USB spec. In an attempt to make
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* them usable, we will try treating them as Interrupt endpoints.
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*/
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if (to_usb_device(ddev)->speed == USB_SPEED_LOW &&
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usb_endpoint_xfer_bulk(d)) {
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dev_warn(ddev, "config %d interface %d altsetting %d "
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"endpoint 0x%X is Bulk; changing to Interrupt\n",
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cfgno, inum, asnum, d->bEndpointAddress);
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endpoint->desc.bmAttributes = USB_ENDPOINT_XFER_INT;
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endpoint->desc.bInterval = 1;
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if (le16_to_cpu(endpoint->desc.wMaxPacketSize) > 8)
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endpoint->desc.wMaxPacketSize = cpu_to_le16(8);
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}
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/*
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* Some buggy high speed devices have bulk endpoints using
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* maxpacket sizes other than 512. High speed HCDs may not
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* be able to handle that particular bug, so let's warn...
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*/
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if (to_usb_device(ddev)->speed == USB_SPEED_HIGH
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&& usb_endpoint_xfer_bulk(d)) {
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unsigned maxp;
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maxp = le16_to_cpu(endpoint->desc.wMaxPacketSize) & 0x07ff;
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if (maxp != 512)
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dev_warn(ddev, "config %d interface %d altsetting %d "
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"bulk endpoint 0x%X has invalid maxpacket %d\n",
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cfgno, inum, asnum, d->bEndpointAddress,
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maxp);
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}
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/* Parse a possible SuperSpeed endpoint companion descriptor */
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if (to_usb_device(ddev)->speed == USB_SPEED_SUPER)
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usb_parse_ss_endpoint_companion(ddev, cfgno,
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inum, asnum, endpoint, buffer, size);
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/* Skip over any Class Specific or Vendor Specific descriptors;
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* find the next endpoint or interface descriptor */
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endpoint->extra = buffer;
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i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
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USB_DT_INTERFACE, &n);
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endpoint->extralen = i;
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retval = buffer - buffer0 + i;
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if (n > 0)
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dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
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n, plural(n), "endpoint");
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return retval;
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skip_to_next_endpoint_or_interface_descriptor:
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i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
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USB_DT_INTERFACE, NULL);
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return buffer - buffer0 + i;
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}
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void usb_release_interface_cache(struct kref *ref)
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{
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struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref);
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int j;
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for (j = 0; j < intfc->num_altsetting; j++) {
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struct usb_host_interface *alt = &intfc->altsetting[j];
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kfree(alt->endpoint);
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kfree(alt->string);
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}
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kfree(intfc);
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}
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static int usb_parse_interface(struct device *ddev, int cfgno,
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struct usb_host_config *config, unsigned char *buffer, int size,
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u8 inums[], u8 nalts[])
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{
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unsigned char *buffer0 = buffer;
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struct usb_interface_descriptor *d;
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int inum, asnum;
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struct usb_interface_cache *intfc;
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struct usb_host_interface *alt;
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int i, n;
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int len, retval;
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int num_ep, num_ep_orig;
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d = (struct usb_interface_descriptor *) buffer;
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buffer += d->bLength;
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size -= d->bLength;
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if (d->bLength < USB_DT_INTERFACE_SIZE)
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goto skip_to_next_interface_descriptor;
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/* Which interface entry is this? */
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intfc = NULL;
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inum = d->bInterfaceNumber;
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for (i = 0; i < config->desc.bNumInterfaces; ++i) {
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if (inums[i] == inum) {
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intfc = config->intf_cache[i];
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break;
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}
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}
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if (!intfc || intfc->num_altsetting >= nalts[i])
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goto skip_to_next_interface_descriptor;
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/* Check for duplicate altsetting entries */
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asnum = d->bAlternateSetting;
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for ((i = 0, alt = &intfc->altsetting[0]);
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i < intfc->num_altsetting;
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(++i, ++alt)) {
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if (alt->desc.bAlternateSetting == asnum) {
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dev_warn(ddev, "Duplicate descriptor for config %d "
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"interface %d altsetting %d, skipping\n",
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cfgno, inum, asnum);
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goto skip_to_next_interface_descriptor;
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}
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}
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++intfc->num_altsetting;
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memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE);
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/* Skip over any Class Specific or Vendor Specific descriptors;
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* find the first endpoint or interface descriptor */
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alt->extra = buffer;
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i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
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USB_DT_INTERFACE, &n);
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alt->extralen = i;
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if (n > 0)
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dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
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n, plural(n), "interface");
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buffer += i;
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size -= i;
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/* Allocate space for the right(?) number of endpoints */
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num_ep = num_ep_orig = alt->desc.bNumEndpoints;
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alt->desc.bNumEndpoints = 0; /* Use as a counter */
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if (num_ep > USB_MAXENDPOINTS) {
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dev_warn(ddev, "too many endpoints for config %d interface %d "
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"altsetting %d: %d, using maximum allowed: %d\n",
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cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS);
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num_ep = USB_MAXENDPOINTS;
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}
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if (num_ep > 0) {
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/* Can't allocate 0 bytes */
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len = sizeof(struct usb_host_endpoint) * num_ep;
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alt->endpoint = kzalloc(len, GFP_KERNEL);
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if (!alt->endpoint)
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return -ENOMEM;
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}
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/* Parse all the endpoint descriptors */
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n = 0;
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while (size > 0) {
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if (((struct usb_descriptor_header *) buffer)->bDescriptorType
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== USB_DT_INTERFACE)
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break;
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retval = usb_parse_endpoint(ddev, cfgno, inum, asnum, alt,
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num_ep, buffer, size);
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if (retval < 0)
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return retval;
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++n;
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buffer += retval;
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size -= retval;
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}
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if (n != num_ep_orig)
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dev_warn(ddev, "config %d interface %d altsetting %d has %d "
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"endpoint descriptor%s, different from the interface "
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"descriptor's value: %d\n",
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cfgno, inum, asnum, n, plural(n), num_ep_orig);
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return buffer - buffer0;
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skip_to_next_interface_descriptor:
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i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
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USB_DT_INTERFACE, NULL);
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return buffer - buffer0 + i;
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}
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static int usb_parse_configuration(struct usb_device *dev, int cfgidx,
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struct usb_host_config *config, unsigned char *buffer, int size)
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{
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struct device *ddev = &dev->dev;
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unsigned char *buffer0 = buffer;
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int cfgno;
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int nintf, nintf_orig;
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int i, j, n;
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struct usb_interface_cache *intfc;
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unsigned char *buffer2;
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int size2;
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struct usb_descriptor_header *header;
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int len, retval;
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u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES];
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unsigned iad_num = 0;
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memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE);
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if (config->desc.bDescriptorType != USB_DT_CONFIG ||
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config->desc.bLength < USB_DT_CONFIG_SIZE) {
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dev_err(ddev, "invalid descriptor for config index %d: "
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"type = 0x%X, length = %d\n", cfgidx,
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config->desc.bDescriptorType, config->desc.bLength);
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return -EINVAL;
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}
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cfgno = config->desc.bConfigurationValue;
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buffer += config->desc.bLength;
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size -= config->desc.bLength;
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nintf = nintf_orig = config->desc.bNumInterfaces;
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if (nintf > USB_MAXINTERFACES) {
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dev_warn(ddev, "config %d has too many interfaces: %d, "
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"using maximum allowed: %d\n",
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cfgno, nintf, USB_MAXINTERFACES);
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nintf = USB_MAXINTERFACES;
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}
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/* Go through the descriptors, checking their length and counting the
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* number of altsettings for each interface */
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n = 0;
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for ((buffer2 = buffer, size2 = size);
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size2 > 0;
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(buffer2 += header->bLength, size2 -= header->bLength)) {
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if (size2 < sizeof(struct usb_descriptor_header)) {
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dev_warn(ddev, "config %d descriptor has %d excess "
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"byte%s, ignoring\n",
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cfgno, size2, plural(size2));
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break;
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}
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header = (struct usb_descriptor_header *) buffer2;
|
|
if ((header->bLength > size2) || (header->bLength < 2)) {
|
|
dev_warn(ddev, "config %d has an invalid descriptor "
|
|
"of length %d, skipping remainder of the config\n",
|
|
cfgno, header->bLength);
|
|
break;
|
|
}
|
|
|
|
if (header->bDescriptorType == USB_DT_INTERFACE) {
|
|
struct usb_interface_descriptor *d;
|
|
int inum;
|
|
|
|
d = (struct usb_interface_descriptor *) header;
|
|
if (d->bLength < USB_DT_INTERFACE_SIZE) {
|
|
dev_warn(ddev, "config %d has an invalid "
|
|
"interface descriptor of length %d, "
|
|
"skipping\n", cfgno, d->bLength);
|
|
continue;
|
|
}
|
|
|
|
inum = d->bInterfaceNumber;
|
|
|
|
if ((dev->quirks & USB_QUIRK_HONOR_BNUMINTERFACES) &&
|
|
n >= nintf_orig) {
|
|
dev_warn(ddev, "config %d has more interface "
|
|
"descriptors, than it declares in "
|
|
"bNumInterfaces, ignoring interface "
|
|
"number: %d\n", cfgno, inum);
|
|
continue;
|
|
}
|
|
|
|
if (inum >= nintf_orig)
|
|
dev_warn(ddev, "config %d has an invalid "
|
|
"interface number: %d but max is %d\n",
|
|
cfgno, inum, nintf_orig - 1);
|
|
|
|
/* Have we already encountered this interface?
|
|
* Count its altsettings */
|
|
for (i = 0; i < n; ++i) {
|
|
if (inums[i] == inum)
|
|
break;
|
|
}
|
|
if (i < n) {
|
|
if (nalts[i] < 255)
|
|
++nalts[i];
|
|
} else if (n < USB_MAXINTERFACES) {
|
|
inums[n] = inum;
|
|
nalts[n] = 1;
|
|
++n;
|
|
}
|
|
|
|
} else if (header->bDescriptorType ==
|
|
USB_DT_INTERFACE_ASSOCIATION) {
|
|
if (iad_num == USB_MAXIADS) {
|
|
dev_warn(ddev, "found more Interface "
|
|
"Association Descriptors "
|
|
"than allocated for in "
|
|
"configuration %d\n", cfgno);
|
|
} else {
|
|
config->intf_assoc[iad_num] =
|
|
(struct usb_interface_assoc_descriptor
|
|
*)header;
|
|
iad_num++;
|
|
}
|
|
|
|
} else if (header->bDescriptorType == USB_DT_DEVICE ||
|
|
header->bDescriptorType == USB_DT_CONFIG)
|
|
dev_warn(ddev, "config %d contains an unexpected "
|
|
"descriptor of type 0x%X, skipping\n",
|
|
cfgno, header->bDescriptorType);
|
|
|
|
} /* for ((buffer2 = buffer, size2 = size); ...) */
|
|
size = buffer2 - buffer;
|
|
config->desc.wTotalLength = cpu_to_le16(buffer2 - buffer0);
|
|
|
|
if (n != nintf)
|
|
dev_warn(ddev, "config %d has %d interface%s, different from "
|
|
"the descriptor's value: %d\n",
|
|
cfgno, n, plural(n), nintf_orig);
|
|
else if (n == 0)
|
|
dev_warn(ddev, "config %d has no interfaces?\n", cfgno);
|
|
config->desc.bNumInterfaces = nintf = n;
|
|
|
|
/* Check for missing interface numbers */
|
|
for (i = 0; i < nintf; ++i) {
|
|
for (j = 0; j < nintf; ++j) {
|
|
if (inums[j] == i)
|
|
break;
|
|
}
|
|
if (j >= nintf)
|
|
dev_warn(ddev, "config %d has no interface number "
|
|
"%d\n", cfgno, i);
|
|
}
|
|
|
|
/* Allocate the usb_interface_caches and altsetting arrays */
|
|
for (i = 0; i < nintf; ++i) {
|
|
j = nalts[i];
|
|
if (j > USB_MAXALTSETTING) {
|
|
dev_warn(ddev, "too many alternate settings for "
|
|
"config %d interface %d: %d, "
|
|
"using maximum allowed: %d\n",
|
|
cfgno, inums[i], j, USB_MAXALTSETTING);
|
|
nalts[i] = j = USB_MAXALTSETTING;
|
|
}
|
|
|
|
len = sizeof(*intfc) + sizeof(struct usb_host_interface) * j;
|
|
config->intf_cache[i] = intfc = kzalloc(len, GFP_KERNEL);
|
|
if (!intfc)
|
|
return -ENOMEM;
|
|
kref_init(&intfc->ref);
|
|
}
|
|
|
|
/* FIXME: parse the BOS descriptor */
|
|
|
|
/* Skip over any Class Specific or Vendor Specific descriptors;
|
|
* find the first interface descriptor */
|
|
config->extra = buffer;
|
|
i = find_next_descriptor(buffer, size, USB_DT_INTERFACE,
|
|
USB_DT_INTERFACE, &n);
|
|
config->extralen = i;
|
|
if (n > 0)
|
|
dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
|
|
n, plural(n), "configuration");
|
|
buffer += i;
|
|
size -= i;
|
|
|
|
/* Parse all the interface/altsetting descriptors */
|
|
while (size > 0) {
|
|
retval = usb_parse_interface(ddev, cfgno, config,
|
|
buffer, size, inums, nalts);
|
|
if (retval < 0)
|
|
return retval;
|
|
|
|
buffer += retval;
|
|
size -= retval;
|
|
}
|
|
|
|
/* Check for missing altsettings */
|
|
for (i = 0; i < nintf; ++i) {
|
|
intfc = config->intf_cache[i];
|
|
for (j = 0; j < intfc->num_altsetting; ++j) {
|
|
for (n = 0; n < intfc->num_altsetting; ++n) {
|
|
if (intfc->altsetting[n].desc.
|
|
bAlternateSetting == j)
|
|
break;
|
|
}
|
|
if (n >= intfc->num_altsetting)
|
|
dev_warn(ddev, "config %d interface %d has no "
|
|
"altsetting %d\n", cfgno, inums[i], j);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* hub-only!! ... and only exported for reset/reinit path.
|
|
* otherwise used internally on disconnect/destroy path
|
|
*/
|
|
void usb_destroy_configuration(struct usb_device *dev)
|
|
{
|
|
int c, i;
|
|
|
|
if (!dev->config)
|
|
return;
|
|
|
|
if (dev->rawdescriptors) {
|
|
for (i = 0; i < dev->descriptor.bNumConfigurations; i++)
|
|
kfree(dev->rawdescriptors[i]);
|
|
|
|
kfree(dev->rawdescriptors);
|
|
dev->rawdescriptors = NULL;
|
|
}
|
|
|
|
for (c = 0; c < dev->descriptor.bNumConfigurations; c++) {
|
|
struct usb_host_config *cf = &dev->config[c];
|
|
|
|
kfree(cf->string);
|
|
for (i = 0; i < cf->desc.bNumInterfaces; i++) {
|
|
if (cf->intf_cache[i])
|
|
kref_put(&cf->intf_cache[i]->ref,
|
|
usb_release_interface_cache);
|
|
}
|
|
}
|
|
kfree(dev->config);
|
|
dev->config = NULL;
|
|
}
|
|
|
|
|
|
/*
|
|
* Get the USB config descriptors, cache and parse'em
|
|
*
|
|
* hub-only!! ... and only in reset path, or usb_new_device()
|
|
* (used by real hubs and virtual root hubs)
|
|
*
|
|
* NOTE: if this is a WUSB device and is not authorized, we skip the
|
|
* whole thing. A non-authorized USB device has no
|
|
* configurations.
|
|
*/
|
|
int usb_get_configuration(struct usb_device *dev)
|
|
{
|
|
struct device *ddev = &dev->dev;
|
|
int ncfg = dev->descriptor.bNumConfigurations;
|
|
int result = 0;
|
|
unsigned int cfgno, length;
|
|
unsigned char *bigbuffer;
|
|
struct usb_config_descriptor *desc;
|
|
|
|
cfgno = 0;
|
|
if (dev->authorized == 0) /* Not really an error */
|
|
goto out_not_authorized;
|
|
result = -ENOMEM;
|
|
if (ncfg > USB_MAXCONFIG) {
|
|
dev_warn(ddev, "too many configurations: %d, "
|
|
"using maximum allowed: %d\n", ncfg, USB_MAXCONFIG);
|
|
dev->descriptor.bNumConfigurations = ncfg = USB_MAXCONFIG;
|
|
}
|
|
|
|
if (ncfg < 1) {
|
|
dev_err(ddev, "no configurations\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
length = ncfg * sizeof(struct usb_host_config);
|
|
dev->config = kzalloc(length, GFP_KERNEL);
|
|
if (!dev->config)
|
|
goto err2;
|
|
|
|
length = ncfg * sizeof(char *);
|
|
dev->rawdescriptors = kzalloc(length, GFP_KERNEL);
|
|
if (!dev->rawdescriptors)
|
|
goto err2;
|
|
|
|
desc = kmalloc(USB_DT_CONFIG_SIZE, GFP_KERNEL);
|
|
if (!desc)
|
|
goto err2;
|
|
|
|
result = 0;
|
|
for (; cfgno < ncfg; cfgno++) {
|
|
/* We grab just the first descriptor so we know how long
|
|
* the whole configuration is */
|
|
result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
|
|
desc, USB_DT_CONFIG_SIZE);
|
|
if (result < 0) {
|
|
dev_err(ddev, "unable to read config index %d "
|
|
"descriptor/%s: %d\n", cfgno, "start", result);
|
|
dev_err(ddev, "chopping to %d config(s)\n", cfgno);
|
|
dev->descriptor.bNumConfigurations = cfgno;
|
|
break;
|
|
} else if (result < 4) {
|
|
dev_err(ddev, "config index %d descriptor too short "
|
|
"(expected %i, got %i)\n", cfgno,
|
|
USB_DT_CONFIG_SIZE, result);
|
|
result = -EINVAL;
|
|
goto err;
|
|
}
|
|
length = max((int) le16_to_cpu(desc->wTotalLength),
|
|
USB_DT_CONFIG_SIZE);
|
|
|
|
/* Now that we know the length, get the whole thing */
|
|
bigbuffer = kmalloc(length, GFP_KERNEL);
|
|
if (!bigbuffer) {
|
|
result = -ENOMEM;
|
|
goto err;
|
|
}
|
|
result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
|
|
bigbuffer, length);
|
|
if (result < 0) {
|
|
dev_err(ddev, "unable to read config index %d "
|
|
"descriptor/%s\n", cfgno, "all");
|
|
kfree(bigbuffer);
|
|
goto err;
|
|
}
|
|
if (result < length) {
|
|
dev_warn(ddev, "config index %d descriptor too short "
|
|
"(expected %i, got %i)\n", cfgno, length, result);
|
|
length = result;
|
|
}
|
|
|
|
dev->rawdescriptors[cfgno] = bigbuffer;
|
|
|
|
result = usb_parse_configuration(dev, cfgno,
|
|
&dev->config[cfgno], bigbuffer, length);
|
|
if (result < 0) {
|
|
++cfgno;
|
|
goto err;
|
|
}
|
|
}
|
|
result = 0;
|
|
|
|
err:
|
|
kfree(desc);
|
|
out_not_authorized:
|
|
dev->descriptor.bNumConfigurations = cfgno;
|
|
err2:
|
|
if (result == -ENOMEM)
|
|
dev_err(ddev, "out of memory\n");
|
|
return result;
|
|
}
|